Furnace-stoker for feeding coal-dust or other comminuted fuels.



C. L. HEISLER.

FURNACE STOKER FOR FEEDING COAL DUST OR OTHER COMMINUTED FUELS.

APPLICATION FILED JAN. 20, 1913- p 1 1? @17O Patented May 25, 1910.

2 SHEETS-SHEET I.

WITNESSES:

C. L. HEISLER.

FURNACE STOKER FOR FEEDI NG COAL DUST OR OTHER COMMINUTED FUELS.

APPLICATION FILED JAN-20, 1913.

1 M 817o Patented May 25, 1915.

2 SHEETQ-SHEET 2.

FIG. 3

l Vl ZNESSfiS: INVENTOR. ,MWWM Md BY ATTORNEY.

UNTTJED' STATES PATENT. @FFTQE CHARLES L. HEISLER, 0F SCHENECTADY, NEWYORK.

FURNACE-STICKER FOR FEEDING COAL-DUST OR OTHER COMMINU'TED FUELS,

Application filed January 20, 1913. Serial No. 743,202.

To all whom it may concern Be it known that 1, CHARLES L. HEISLER, acitizen of the United States, residing at Schenectady, in the county ofSchenectady, in the State of New York, have invented certain new anduseful Improvements in Fur- The further object is to provide a com- 7paratively light simple and compact machine with a wide range ofcapacity that can be maintained and successfully operated on alocomotive; a service wherein the chances of failure must be reduced toa minimum.

In the accompanying drawings Figure 1, shows a plan view of thebottom'of the fuel hopper parts that are not directly related to myinvention are broken away, as it is of usual construction. This figurealso shows a plan view of the feed screw and the pocketed distributingwheel with the upper portion of the casing cut away,-and with thefurnace feed pipes broken off near the wheel casing. Fig. 2, illustratesan exterior end view of the wheel casing with a small portion brokenaway to show a spoke of the pocketed wheel. This view also shows severalfeed mixture outlets and several air blast inlet pipes broken away. Adriving shaft is shown broken off near the wheel casing. Fig. 3, shows asectional elevation on the line B B of Figs. 1 and 4, with the.

air blast, furnace feed pipes, and part of the fuel hopper, broken away.Fig. 4-, shows a cross sectional end View on the line A A, of Fig. 3 andillustrates the cellular construction of the distributing pocketedwheel, and a centrally disposed inclined partition, which separates thefilling side from the blowing side of the wheel. This view also showsthe conveyer blades, which take the dust from the screw and force itinto the lower grate pockets in the wheel. Fig. 5,

shows a plan of a, detail broken from the.

feed control lever 17, shown in Fig. 3. Fig. 6, shows an outline of thedevice as applied to a locomotive. This view only shows such parts ofthe locomotive and tender that are Specification of Letters Patent.

Patented May 25, 11915..

adjacent to the stoker. Fig. 7 shows a plan of a smaller gravity fedpocketed or grated. wheel with part of the case broken away. Fig. 8, isa vertical longitudinal section thereof. Fig. 9, is an end sectionalview in part showing a portion of the case and wheel broken away. Thiswheel is fed from above the wheel by gravity.

In the several drawings, the numeral 1 represents a hopper for storingcomminuted fuel, and which may be of any convenient size. .On alocomotive it may store a number of tons and is mounted upon a tender.

2 is a screw conveyer of usual construction, and may extend to the rearof the hop per, which is not shown because it is of usual construction.

3, 3 and 3 are conveying blades, arranged at the delivery end of thescrew 2 for the purpose of conveying the fuel, delivered by the screw,to theinterior periphery of the pocketed or grated distributing wheel,4, rotatively mounted in the casing 55. The distributing wheel, 4, issupported by radial spokes, 6, projecting from a central hub 8 keyed onthe hollow shaft, 7. This hub 8 extends through the casing cover 10 and,is rigidly keyed to the worm wheel 11, which is driven by any suitablemotor through the worm shaft 12. The hollow shaft, 7, can rotate freelyon the clutch shaft, 9, and is rigidly fastened to the con veyerblades3, 3 and 3, at its left end as shown in Fig. 4. The conveyer blades 3,3, 3 therefore revolve continually with the grated distributing wheel,l, because the hollow shaft, 7, is rigidly keyed to the grate wheel hubas already stated.

@n the right end of the shaft 9, is a lever actuated clutch, 13, that isadapted to engage with a corresponding clutch, 14 formed on the hub ofthe grate wheel, 4:, as shown. When the clutch is thrown into engagementby means of the lever, 15, the clutch shaft,

9, rotates and thereby actuates the screw 2.

this arrangement a manual, or automatic, manipulation of the lever, 15,will stop, or start, the screw, 2, as desired. It slotted link 16,engages with a pin 16 pro jecting from the upper end of the lever 15. Atits opposite end the link is connected with an elbow feed control lever,17, as shown and in a manner to cause the clutch 13, to engage with 14-,when the feed control blade 17 drops to the dotted position. Anexcessive accumulation of fuel delivered by the screw 2 will cause theblade 17, to be lifted and thereby stop the feed. Moreover, when thereis a want of supply at the blades 3, the control blade 17*, will dropand again start the screw 2.

It will be noted that the periphery of the grated distributing wheel 4,is of cellular construction, having rectangular pockets for lifting anddistributing the dust, received from the blades, 3, into the lower wheelpockets, to its upper side when rotating as indicated by the darts. Thedust is prevented, from spilling prematurely, by the semi-cylindricalguard 18, until the proper instant, when each pocket comes over thecorresponding air blast opening. For example, the pockets I, must comeover the blast outlet 19, at the zigzag edge 25, of the guard 18.Likewise the pockets 4", must come directly over the blast outlet 20;the pockets 4 over the blast outlet 21, and the pocket 4; over'the blastpipe 22, which extends from the casing wall 23, Fig. 1, inwardly to thepockets 4. The zigzag edge 25 has downwardly projecting flanges 18 whichform wings or partitions between the blast pipes, as shown in Fig. 4:,for the purpose of preventing scattering of the blasts, and to guide thedust and blast mixture to the dust feed pipe outlets, 19, 20, 21 and 22The excess of dust which is not carrred away toward the furnace by thefeed p1pe s, or blast, drops down on the warped partition 26 and glidesinto the lower pockets of the distributing wheel to be again returned.-Evidently if this surplus fills the pockets, as in case when the blastis shut off, no additional dust can be fed by the blades 3, 3, 3*, intothe pockets after they pass the warped partition 26 toward the left.This would result in an accumulation of dust under the blade 17, andthereby would lift it and stop the screw 2. To prevent the dust fromadhering to the pockets, small air jets 27, 27, 27 and 27, are placedover the pockets at the corresponding air blast discharge outlets. Thesejets may take air from any source, but are each preferably connected toone of the corresponding blast inlets, 19 20 21 and 22 In Fig. 6, isshownthe application of my 1nvent1on to a locomotive, in which thestoker is placed between the locomotive and Its tender, with the furnacefeed pipes, 22, leading to the furnace, 22 in the usual manner. In likemanner it may be applied to a stationary furnace.

In Figs. 7, -8 and 9, is shown a smaller grate distributing wheel 40,mounted upon a driving shaft, 90, within a case 50. The spokes 60, areintegralwith the hub 80, and are bolted to the pocketed wheel rim 40,for convenience when renewing. There are two air blast inlets 51 and 52,which blow directly across the case through the wheel and into two fuelmixture outlets; 53, only I being shown. In this construction thecompockets, means secured to said casing to retain the fuel in saidpockets until they reach the top portion of their circular path oftravel, the fuel then falling out of the same, alined air-inlet 'andair-and-fuel-outlet pipes leading respectively into and from said casingbeneath the top part. of said wheel, andmeans to direct any fuel, whichis not carried into said outlet pipe by the air blast, back into thepockets, at the bottom of the wheel. I

2. In a stoker for comminuted fuel, the combination of a rotary wheel,internal radial blades thereon forming pockets, means to deliver thefuel into the lower part of said wheel, a guard to retain the fuel insaid pockets until they reach the top of the wheel, and alined air-inletand air-and-fueloutlet pipes, the axis of which is located in a planebeyond. theend of said guard and beneath the top portion of the wheel,whereby the fuel, as it falls out of said pockets, is carried by the airblast into the outlet pipe leading to the furnace, and fuel not socarried drops back into the pockets at the bottom of the wheel, iscarried up and again dropped into the path of the air blast.

3. In a stoker for comminuted fuel, the combination of a casing, apocketed wheel rotatively mounted therein, means to deliver fuel intosaid pockets before they reach the top of their path of travel, anair-blast inlet pipe leading into said casing, an air-and-fuel-outletpipe leading out of said casing in alinement with said inlet pipe, andmeans to retain the fuel in said pockets until they reach an el.evation.such that the fuel will fall by gravity between the adjacent ends ofsaid pipes.

4. In a stoker for comminuted fuel, the combination withv a source offuel supply, a casing, means for delivering fuel thereto, a plurality ofair blast inlet pipes project ing into said casing, air and fuel mixturecombination with a source of fuel supply, a casing, means for deliveringfuel thereto, comprising a screw conveyer and rotary conveyer bladesdisposed between said screw and the casing, an air blast inlet pipeprojecting into said casing, an air and fuel mixture outlet pipe inalinement with said inlet pipe, a journal bearing, a rotary distributingwheel supported thereby and mounted within said casingfa'nd means todirect back to the wheel the surplus fuel not blown through the outletpipe.

6. In a stoker for comminuted fuel, the combination with a source offuel supply, a casing, means for delivering fuel thereto, comprising ascrew conveyer, an air blast inlet pipe projecting into said casin anair and fuel mixture outlet pipe in alinement with said inletpipe,journal bearings, a rotary distributing wheel supported thereby withinsaid casing and adapted to spill comminuted fuel into said blast, aclutch cou pling said conveyer with the wheel, and operable-means fordisengaging said clutch to permit said conveyer to stop while the wheelcontinues to rotate.

7. In a stoker for comininuted fuel,.the combination with a source offuel supply,

a casing, means for delivering fuel thereto,

comprising a screw conveyer, an air blast inlet pipe projecting intosaid casing, an air and fuel mixture outlet pipe in alinement with saidinlet pipe, journal bearings, a rotary distributing wheel supportedthereby within said casing and adapted to spill comminuted fuel intosaid blast, a clutch coupling said conveyer with the wheel, operablemeans for disengaging said clutch to permit said conveyer to stop whilethe wheel continues to rotate, and a member coupled to said clutch andadapted to be actuated by the accumulation of fuel at the wheel.

8. In a stoker for comminuted fuel, the combination with a source offuel supply,

a casing, means for delivering fuel thereto,

comprising a screw conveyer, an air blast inlet plpe pro ecting intosaid casing, an air and fuel mixture outlet pipe in alinement with saidinlet pipe, journal bearings, a rotary distributing wheel supportedthereby within said casing and adapted to spill comininuted fuel intosaid blast, a clutch coupling said conveyer with the wheel, and operablemeans for disengaging said clutch to permit said conveyer to stop whilethe wheel continues to rotate, a member coupled to said clutch andadapted to be actuated by the accumulation of fuel at the wheel, andmeans for disengaging said member from the clutch to permit manualoperation thereof,

9. In a stoker for comminuted fuel, the combination with a source offuel supply, a casing, means for delivering fuel thereto, an air blastinlet pipe projecting into sai casing, a journal bearing, a rotarydistributing wheel supported thereby within said casing, and adapted tospill comminuted fuel into said blast, an air and fuel outlet pipe inalinement with said inlet pipe, a hollow shaft rigidly attached to saidwheel, a conveyer shaft extending through said hollow shaft and meansfor coupling it to said wheel.

10, In a stoker for comminuted fuel, the combination with a source offuel supply, a casing, means for delivering fuel thereto, an air blastinlet pipe projecting into said casing, an air and fuel mixture outletpipe in alinement with said inlet pipe, a journa bearing, a rotarydistributing wheel supported thereby, within said casing, and adapted tospill comminuted fuel into said b ast, and means to direct back to thewheel the surplus fuel not blown through the outlet, said wheel having arim with pockets formed therein, and a shield member engaged therewithto prevent prematurely spilling fuel from said pockets, while conveyingand distributing fuel to the air blasts.

oneness L. nnrstn n.

Witnesses Cnas. L. HEISLER, J12,

S. E. Wnn'rs.

